" Vim syntax file
" Language: Liquid
" Maintainer: Tim Pope <[email protected]>
" Filenames: *.liquid
" Last Change: 2013 May 30

if exists('b:current_syntax')
finish
endif

if !exists('main_syntax')
let main_syntax = 'liquid'
endif

if !exists('g:liquid_default_subtype')
let g:liquid_default_subtype = 'html'
endif

if !exists('b:liquid_subtype') && main_syntax == 'liquid'
let s:lines = getline(1)."\n".getline(2)."\n".getline(3)."\n".getline(4)."\n".getline(5)."\n".getline("$")
let b:liquid_subtype = matchstr(s:lines,'liquid_subtype=\zs\w\+')
if b:liquid_subtype == ''
let b:liquid_subtype = matchstr(&filetype,'^liquid\.\zs\w\+')
endif
if b:liquid_subtype == ''
let b:liquid_subtype = matchstr(substitute(expand('%:t'),'\c\%(\.liquid\)\+$','',''),'\.\zs\w\+$')
endif
if b:liquid_subtype == ''
let b:liquid_subtype = g:liquid_default_subtype
endif
endif

if exists('b:liquid_subtype') && b:liquid_subtype != ''
exe 'runtime! syntax/'.b:liquid_subtype.'.vim'
unlet! b:current_syntax
endif

syn case match

if exists('b:liquid_subtype') && b:liquid_subtype != 'yaml'
" YAML Front Matter
syn include @liquidYamlTop syntax/yaml.vim
unlet! b:current_syntax
syn region liquidYamlHead start="\%^---$" end="^---\s*$" keepend contains=@liquidYamlTop,@Spell
endif

if !exists('g:liquid_highlight_types')
let g:liquid_highlight_types = []
endif

if !exists('s:subtype')
let s:subtype = exists('b:liquid_subtype') ? b:liquid_subtype : ''

for s:type in map(copy(g:liquid_highlight_types),'matchstr(v:val,"[^=]*$")')
if s:type =~ '\.'
let b:{matchstr(s:type,'[^.]*')}_subtype = matchstr(s:type,'\.\zs.*')
endif
exe 'syn include @liquidHighlight'.substitute(s:type,'\.','','g').' syntax/'.matchstr(s:type,'[^.]*').'.vim'
unlet! b:current_syntax
endfor
unlet! s:type

if s:subtype == ''
unlet! b:liquid_subtype
else
let b:liquid_subtype = s:subtype
endif
unlet s:subtype
endif

syn region liquidStatement matchgroup=liquidDelimiter start="{%" end="%}" contains=@liquidStatement containedin=ALLBUT,@liquidExempt keepend
syn region liquidExpression matchgroup=liquidDelimiter start="{{" end="}}" contains=@liquidExpression containedin=ALLBUT,@liquidExempt keepend
syn region liquidComment matchgroup=liquidDelimiter start="{%\s*comment\s*%}" end="{%\s*endcomment\s*%}" contains=liquidTodo,@Spell containedin=ALLBUT,@liquidExempt keepend
syn region liquidRaw matchgroup=liquidDelimiter start="{%\s*raw\s*%}" end="{%\s*endraw\s*%}" contains=TOP,@liquidExempt containedin=ALLBUT,@liquidExempt keepend

syn cluster liquidExempt contains=liquidStatement,liquidExpression,liquidComment,liquidRaw,@liquidStatement,liquidYamlHead
syn cluster liquidStatement contains=liquidConditional,liquidRepeat,liquidKeyword,@liquidExpression
syn cluster liquidExpression contains=liquidOperator,liquidString,liquidNumber,liquidFloat,liquidBoolean,liquidNull,liquidEmpty,liquidPipe,liquidForloop

syn keyword liquidKeyword highlight nextgroup=liquidTypeHighlight skipwhite contained
syn keyword liquidKeyword endhighlight contained
syn region liquidHighlight start="{%\s*highlight\s\+\w\+\s*%}" end="{% endhighlight %}" keepend

for s:type in g:liquid_highlight_types
exe 'syn match liquidTypeHighlight "\<'.matchstr(s:type,'[^=]*').'\>" contained'
exe 'syn region liquidHighlight'.substitute(matchstr(s:type,'[^=]*$'),'\..*','','').' start="{%\s*highlight\s\+'.matchstr(s:type,'[^=]*').'\s*%}" end="{% endhighlight %}" keepend contains=@liquidHighlight'.substitute(matchstr(s:type,'[^=]*$'),'\.','','g')
endfor
unlet! s:type

syn region liquidString matchgroup=liquidQuote start=+"+ end=+"+ contained
syn region liquidString matchgroup=liquidQuote start=+'+ end=+'+ contained
syn match liquidNumber "-\=\<\d\+\>" contained
syn match liquidFloat "-\=\<\d\+\>\.\.\@!\%(\d\+\>\)\=" contained
syn keyword liquidBoolean true false contained
syn keyword liquidNull null nil contained
syn match liquidEmpty "\<empty\>" contained

syn keyword liquidOperator and or not contained
syn match liquidPipe '|' contained skipwhite nextgroup=liquidFilter

syn keyword liquidFilter date capitalize downcase upcase first last join sort size strip_html strip_newlines newline_to_br replace replace_first remove remove_first truncate truncatewords prepend append minus plus times divided_by contained

syn keyword liquidConditional if elsif else endif unless endunless case when endcase ifchanged endifchanged contained
syn keyword liquidRepeat for endfor tablerow endtablerow in contained
syn match liquidRepeat "\%({%\s*\)\@<=empty\>" contained
syn keyword liquidKeyword assign cycle include with contained

syn keyword liquidForloop forloop nextgroup=liquidForloopDot contained
syn match liquidForloopDot "\." nextgroup=liquidForloopAttribute contained
syn keyword liquidForloopAttribute length index index0 rindex rindex0 first last contained

syn keyword liquidTablerowloop tablerowloop nextgroup=liquidTablerowloopDot contained
syn match liquidTablerowloopDot "\." nextgroup=liquidTableForloopAttribute contained
syn keyword liquidTablerowloopAttribute length index index0 col col0 index0 rindex rindex0 first last col_first col_last contained

hi def link liquidDelimiter PreProc
hi def link liquidComment Comment
hi def link liquidTypeHighlight Type
hi def link liquidConditional Conditional
hi def link liquidRepeat Repeat
hi def link liquidKeyword Keyword
hi def link liquidOperator Operator
hi def link liquidString String
hi def link liquidQuote Delimiter
hi def link liquidNumber Number
hi def link liquidFloat Float
hi def link liquidEmpty liquidNull
hi def link liquidNull liquidBoolean
hi def link liquidBoolean Boolean
hi def link liquidFilter Function
hi def link liquidForloop Identifier
hi def link liquidForloopAttribute Identifier

let b:current_syntax = 'liquid'

if exists('main_syntax') && main_syntax == 'liquid'
unlet main_syntax
endif